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Short Term Debt (Short-term debt and the related weighted-average interest rates) (Details) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Short-term Debt [Line Items] |  |
Short-term Debt | $ 1,186 | $ 1,241
Short-term Debt, Weighted Average Interest Rate | 3.34% | 2.42%
TECO Energy Inc. and TECO Finance Inc. [Member] | Line of Credit [Member] |  |
Short-term Debt [Line Items] |  |
Short-term Debt | $ 805 | $ 820
Short-term Debt, Weighted Average Interest Rate | 3.43% | 2.58%
Tampa Electric Division [Member] | Line of Credit [Member] |  |
Short-term Debt [Line Items] |  |
Short-term Debt | $ 302 | $ 382
Short-term Debt, Weighted Average Interest Rate | 3.10% | 2.07%
New Mexico Gas Company [Member] | Line of Credit [Member] |  |
Short-term Debt [Line Items] |  |
Short-term Debt | $ 79 | $ 38
Short-term Debt, Weighted Average Interest Rate | 3.40% | 2.47%
Nova Scotia Power Inc. [Member] | Notes Payable to Banks [Member] |  |
Short-term Debt [Line Items] |  |
Short-term Debt | $ 0 | $ 1
Short-term Debt, Weighted Average Interest Rate | 0.00% | 0.00%

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- Definition Weighted average interest rate of short-term debt outstanding calculated at point in time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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